A U.S.-backed Syrian force declared victory over the Islamic State group in its former “capital” of Raqqa on Friday, declaring the northern Syrian city free of any extremist presence.

At a press conference held inside the city Friday, the Kurdish-led force known as the Syrian Democratic Forces formally handed over administration of the devastated northern city to a council made up of local officials and tribal leaders.

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In a highly symbolic move, the press conference was held inside the city’s sports stadium which Islamic State militants had turned into an arms depot and a huge prison where they incarcerated and tortured their opponents.

Our victory is one against terrorism, and the liberation of Raqqa marks the latest chapter in the fight against terrorists in Syria,” said Talal Sillo, a spokesman and senior SDF commander.

Standing before a backdrop of shattered buildings, Sillo urged the international community and aid organizations to assist with the city’s reconstruction.

Associated Press drone footage from Raqqa showed the extent of devastation caused by weeks of fighting between Kurdish-led forces and the Islamic State group and thousands of bombs dropped by the U.S.-led coalition.

Drone video from Raqqa, Syria shows neighborhoods reduced to rubble and few signs of civilian life. Kurdish-led forces announced on Thursday that they had driven Islamic State militants out after weeks of fighting.

Footage from Thursday shows the bombed-out shells of buildings and heaps of concrete slabs lay piled on streets littered with destroyed cars. Entire neighborhoods are seen turned to rubble, with little sign of civilian life.

The video showed entire blocks in the city as uninhabitable with knocked-out walls and blown-out windows and doors, while some buildings had several stories turned to piles of debris. The stadium that was used as an arms depot and prison by the extremists appears to have suffered less damage compared with surrounding buildings.

“We call upon all countries and peace-loving forces and all humanitarian organizations to participate in rebuilding the city and villages around it and help in removing the scars of war that were inflicted by the (IS) group,” Sillo said.

Sillo said 655 local and international fighters lost their lives during the four-month battle for Raqqa.

Long before the ground offensive by the Syrian Democratic Forces began in Raqqa in early June, warplanes pounded the city for months.

The U.S.-backed Kurdish-led SDF announced Tuesday they have driven IS militants out of the city after weeks of fighting.

The fall of Raqqa marks a major defeat for IS, which has seen its territories steadily shrink since last year. IS took over Raqqa, located on the Euphrates River, in January 2014, and transformed it into the epicenter of its brutal rule.